A) Z is a carnivore.
B) Y is a herbivore.
C) X is a herbivore.
D) All of these
Correct Answer: D
Solution :X and Y are herbivores hence they did not fed on each other when kept together in captivity and their numbers did not change. Z is a carnivore that fed on Y that is why after introduction of Z, number of Y declined to two.
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